The inverter no-load current is greater than the load current

motor lamination three phase induction wound rotor 

Specifications
1. Lamination of electric motor 
2. IP54 class F 
3. 100% copper 
4. silicon steel stamping 

5.stunning performance 
A 75 kw micro can WIN - G9 inverter commissioning the strange phenomenon Cause: a cement plant users to send a 75 kw can WIN - G9 frequency converter, the cause of the problem is, in the operation of the fire smoke in the inverter, the inverter downtime. Check, the power input circuit of the machine for three phase half controlled bridge, using the principle of controlled rectifier, on the main loop of the dc energy storage capacitor "soft power" and save the small power inverter commonly used rechargeable contactor. In fact half controlled bridge in this here is equivalent to non-contact soft blunt electricity switch. Inspection found that one of the thyristor module electrical motor 12v 1000w terminals have obvious signs of flashover arc burning, but the measurement is not short circuit. Found in the disassembly easily fixed nut landed, flashover reason seems to be a connecting screw loose, causing poor contact. The module for a combination of a diode and a one-way thyristor. And then check the control panel and inverter main circuit, without exception. The module, more than two phase half controlled bridge as the ac electric motor power input, after power on, with a small power 2.2 kW three-phase motor, feel no problem, switch to the new module after a same model, then to the site for installation. 


115/120 V AC Voltage and Three-phase Phase small 240v electric motor
Specifications
1.Specifications1.3-phase asynchronous motors 
2.IEC standard 
3.OEM 
4.Voltage:50HZ &60HZ;380V&415V 

5.Protection class: IP54 
Precaution, first will run to 5 hz frequency, frequency converter load as a fan, motor connector off first, make the motor no-load running. This trial run, got a fright! Frequency at 5 hz, no-load running current 45 a, although feel slightly larger, but consider for a possible repair, or frequency converter for motor winding parameters such as starting curve or torque compensation made adjustment caused by waiting for a reason, without notice. When up to 10 hz inverter panel shows the current and the output current is measured with clip-on table, have reached the 100 a! And the oscillation amplitude of the output current is great, but test the three-phase output voltage, about 70 v, balanced and stable. The motor cable release, electric logging on the inverter output, output frequency 10 hz, the output voltage is 70 v, 20 hz to 150 v, 35 hz to 250 v, after decreasing with frequency, to 50 hz, 400 v. In this process, the measurement of three-phase output voltage balance is very good. The inverter output of V/F curve electricalmotor1.blogspot.com accords with quadratic load torque characteristics. No problem. Output voltage balance and stability, and the output current is too large and the current volatility, obviously for the load caused by abnormal. This is lead to the conclusion of conventional judgment.

Saving electricity

high efficiency high power electric motor Y2 motor

Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 

4. low noise and vibtration
Frequency conversion air conditioner has the characteristics of the system temperature quickly, accurate thermal insulation. On stage, the compressor running at high frequency, can quickly reach the set temperature, the process often need time is very short; And long time of heat preservation phase, the compressor is a low frequency operation, running power only around 300 w; With the capacity of the air conditioning that decide frequency after each startup, have 5 ~ 10 minutes unstable stage, this www.dongfeng-motor.com stage refrigerating capacity is electric motor 12v 500w far from to meet the design requirements, and the power consumption is, in heat preservation phase, are often the air conditioner has just run stability, room temperature has been achieved and cause downtime, this will cause the air conditioner often does not meet the design requirements of operation, causing frequent start-stop, frequently in did not reach the rated refrigerating capacity under the 3 phase induction motor condition of running, this will consume a lot of unnecessary electricity. And frequency conversion air conditioning is based on low frequency operation to replace the downtime, Induction motor low power consumption, at this time there is no open each phase of the unnecessary power consumption, saves the electricity.

The difference between the dc frequency conversion air conditioning and ac frequency conversion air conditioning

gost motor 7.5kw
Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 

4. low noise and vibtration
Ac frequency conversion air conditioning is converts mains power frequency 220 v to 220 v dc power supply, and send it to the power module (transistor switch, etc.); Module is controlled by microcomputer control signal from the at the same time, the output variable frequency power supply (synthetic waveform similar to sine wave), make the compressor motor speed changes over the frequency of the power supply, which can control the displacement compressor, fast regulating system of ANP gost motor refrigeration and heat. Dc inverter air conditioner is also the mains power frequency converting 220 v dc power supply, and sent to the power module, frequency conversion module each time two triode single phase ac motor conduction (A + and A - not at the same time conduction, B +, B - not at the same time conduction, C +, C - not at the same time conduction), to the two-phase windings to direct current (dc), at the same time the module is controlled by the microcomputer, the output voltage variable dc power supply (there is no inverter process), as shown in figure 7, Single phase motor and will be sent to the compressor of the dc motor, dc power supply control displacement compressor. As can be seen from the figure 6, dc inverter ac frequency conversion more than one position detection circuit, makes the dc inverter control more accurate.

From abnormal vibration of asynchronous motor and how to determine the cause of the problem in his voice?

 electric motor 20hp aluminum body 
Specifications
1. 20 years manufacturing experience
2. competitive price,high quality
3. Brand Name: FUJIAN DONGFENG MACHINERY ELECTRICAL LIABILITY CO., LTD

Asynchronous motor produce abnormal vibration and abnormal sound mainly has two aspects of mechanical and electromagnetic. Mechanical reasons: (1), motor blades damage or tighten screw loose blades, blades and the blades into cover, clattering sound produced by it with the weight of the sound, the big small; (2), due to the improper bearing wear or shaft, motor rotor eccentricity caused serious when will make, rotor rub, make the motor produces severe vibration and electric fan motor uneven scratches. (3), motor due to long-term use of the anchor bolt is loose or not foundation, thus the electromagnetic torque of the motor under the action of abnormal vibration; (4), long-term use of the electric motor 12v 500w motor due to a lack of lubricating oil in the bearing inner formed in mill run or bearing steel ball is damaged, therefore make the hiss of the motor bearing interior an exception or purr. Electromagnetic reasons: (1), the normal operation of the motor suddenly appear abnormal sound, in the load running speed decreases significantly, while a low along the roar, may be unbalanced three phase current, the heavy load or single phase operation;


Y2 series electric motor wholesale

Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 
4. low noise and vibtration 

5. AC Voltage: 220V/380V, 380V/660V,400V/690V,220V/400V

(2), the normal operation of the motor, if the stator and rotor winding short-circuit fault ac induction motor 110kw or squirrel cage rotor broken bar when electric are high when low buzz. The fuselage vibration. (1), due to long-term lack of oil running of motor bearing, friction losses increase bearing overheating. In addition, when the motor running, the oil too much or too thick will also cause bearing overheating; (2), when the replacement of lubrication, due to the lubricating oil mixed with hard grain impurity or bearing cleaning uneven net, make bearing wear and overheating, even may damage the bearing; (3), due to improper assembly, fixed end cover wholesalemotor.blogspot.com screw tightness is differ, in a straight line between the two bearing center is unbalanced or bearing outer ring. The bearing rotation is not flexible, adds load after growing friction and heat; (4), belt too tight or motor and were not in a straight line with mechanical shaft center, and thus can increase the bearing load and heat; (5), bearing improper selection or poor quality, such as bearing internal and external ring rust, individual steel ball is not round, etc.; 6, in the operation of the motor bearing damaged, resulting in bearing overheating.